Coettling57 -- read your post on Early Alexander's to Pennsylvania.
I found a website which has been most helpful in deciphering early PA Counties. Might be helpful to you and others.http://www.genealogyinc.com/pennsylvania/maps/
Pennsylvania County Formation Map Resource
I too have a "early Alexander" brickwall I've been trying to locate information on. A John Alexander born in 1766 reportedly in Pennsylvania; I know not where nor when. He was my GGG Grandfather
Hope the map helps